uniquegoods CCM2NJ 12V-40V(max) 3A DC Motor Speed Controller reversible driver Adjustable Variable speed Switch PWM 120W - HHO reversing Input supply voltage: 12V-40VDC(max) PWM frequency: 21KHz ; Duty Cycle range:5%-100% Item size: 2.76*1.54*1.22 inches ; Net weight: 2.54 ounces The maximum output power: 120W; Power-On LED indicator Incorporate a 10A fuse,and with the protection function of reverse connect powersupply.